Powellite

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Physical & Optical Properties

Mohs Hardness 3.5 – 4.0
Specific Gravity 4.23
Refractive Index 1.974 – 1.984
Crystal System Tetragonal
Cleavage Indistinct
Fracture Uneven
Color various
Pleochroism In deeply colored specimens: blue - green

Mohs Hardness

Mohs Hardness: 3.5 – 4.0
1 Soft10 Hard

Crystal System

a b c Tetragonal a = b ≠ c, α = β = γ = 90°

Value & Market

Price Tier Budget (< $50/ct)

About Powellite

Powellite is a calcium molybdate mineral that occurs in brilliant shades of yellow, orange, and pale blue, often displaying strong fluorescence under UV light. It forms as a secondary mineral in the oxidation zones of molybdenite deposits and in skarn environments, with fine specimens found in India, Morocco, and the United States. Its adamantine to resinous luster and fluorescent properties make it a highly desirable collector's mineral.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Powellite?
Powellite is a calcium molybdate mineral that occurs in brilliant shades of yellow, orange, and pale blue, often displaying strong fluorescence under UV light. It forms as a secondary mineral in the oxidation zones of molybdenite deposits and in skarn environments, with fine specimens found in India
What is the hardness of Powellite?
Powellite has a Mohs hardness of 3.5 to 4.0, making it relatively soft for use in jewelry.
What color is Powellite?
Powellite is primarily Various.
How much does Powellite cost?
Powellite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Powellite?
Powellite belongs to the Tetragonal crystal system.

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